The economy blockout kit provides an economical and flexible way to create both 8" x 8" blockouts and 3" round blockouts. The kit includes (3) pieces of 8" x 8" wood blockouts 12" tall and (16) pieces of 3" diameter plastic sleeves 8-1/2" tall. Note that two sleeves can be stacked on top of each other to provide blockouts for floors up to 14-1/2" thick.